#include <stdio.h>
#include <string.h>

int main(int argc, char* argv[])
{
    if(argc != 2)
    {
        printf("Usage：%s [-a/-b/-c]\n", argv[0]);
        return 1;
    }

    const char* arg = argv[1];

    if(strcmp(arg, "-a") == 0)
        printf("这是功能1\n");
    else if(strcmp(arg, "-b") == 0)
        printf("这是功能2\n");
    else if(strcmp(arg, "-c") == 0)
        printf("这是功能3\n");
    else
        printf("Usage：%s [-a/-b/-c]\n", argv[0]);

    return 0;
}
